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Studies on Some Complexes of 3-(4-Pyridyl)-4-Phenyl-1,2,4-Triazole-5- Thione with Cr (III), Zr (IV), V (V), Nb (V) and Ta (V) Ions

R. N. Pandey, S. K. Ojha and R. N. Sharma

Complexes of 3- (4’-pyridyl)-4-phenyl-1,2,4-triazole-5-thione (PpytTH) have been prepared with Cr (III), Zr (IV), V (V), Nb (V) and Ta (V) ions and the structures of the complexes have been investigated by physico-chemical methods. All these complexes are diamagnetic except the Cr (III) complexes, which has magnetic moment equal to 3.79 BM corresponding to octahedral sp3d2 hybridization. In all the complexes, bonding to the metal ions has occurred through sulphur. This has resulted in the blue shifting of thio amide band I, band II and band III, splitting of band II and red shifting of the thio amide band IV from 785 cm-1 in the ligand to 770-750 cm-1 in the complexes. UV and visible spectra of complexes have been interpreted and crystal field calculations have been done for Cr (III) complexes only.